Method of operating a message exchange server related to V2X message transmission and reception and apparatus therefor

Abstract

A method of operating a message exchange server related to vehicle-to-everything (V2X) message transmission and reception in a wireless communication system can include obtaining, by the message exchange server, information of an adjacent message exchange server from a lookup server; and receiving, by the message exchange server, a message published by a User Equipment (UE). Also, in response to determining, by the message exchange server, that a topic included in the message published by the UE is not included in a topic list of the message exchange server, the method can further include transmitting, by the message exchange server, a handover message to the UE.

What is claimed is: 
     
         1 . A method of operating a message exchange server related to vehicle-to-everything (V2X) message transmission and reception in a wireless communication system, the method comprising:
 obtaining, by the message exchange server, a first topic list of an adjacent message exchange server from a lookup server;   receiving, by the message exchange server, a message published by a user equipment (UE); and   in response to determining, by the message exchange server, that a topic included in the message published by the UE is not included in a second topic list of the message exchange server and the topic is included in the first topic list, transmitting, by the message exchange server, a handover message to the UE,   wherein the message exchange server forwards the message published by the UE to other UEs subscribing to the topic regardless of whether or not the topic included in the message published by the UE is included in the second topic list of the message exchange server.   
     
     
         2 . The method of  claim 1 , wherein the handover message includes information of the adjacent message exchange server corresponding to the topic included in the message published by the UE. 
     
     
         3 . The method of  claim 1 , wherein topics included in the second topic list of the message exchange server are included in a management area of the message exchange server. 
     
     
         4 . The method of  claim 1 , wherein the message exchange server and the adjacent message exchange server share one or more topics for a boundary area between a first management area of the message exchange server and a second management area of the adjacent message exchange server. 
     
     
         5 . The method of  claim 4 , wherein the message exchange server delays transmission of the handover message to the UE until the UE is located within the boundary area or exits the boundary area. 
     
     
         6 . The method of  claim 1 , wherein the topic is calculated by the UE based on a current location of the UE. 
     
     
         7 . The method of  claim 1 , wherein the message is a Message Queuing Telemetry Transport (MQTT) Control Packet set as Reserved Control Packet Type=0. 
     
     
         8 . The method of  claim 7 , wherein the MQTT Control Packet includes a Soft V2X specific command in a Variable Header. 
     
     
         9 . The method of  claim 1 , wherein the handover message includes a HANDOVER Command field set to 1 in a Variable Header. 
     
     
         10 . The method of  claim 1 , wherein the UE includes at least one of a vehicle, a mobile terminal, a smart phone, a laptop, a home appliance, an On Board Unit (OBU) or a drone. 
     
     
         11 . A message exchange server related to vehicle-to-everything (V2X) message transmission and reception in a wireless communication system, the message exchange server comprising:
 at least one processor; and   at least one computer memory operably connected to the at least one processor and storing instructions to enable the at least one processor to perform operations when executed, the operations comprising:   obtaining a first topic list of an adjacent message exchange server from a lookup server by the message exchange server;   receiving by the message exchange server a message published by a user equipment (UE); and   in response to determining that a topic included in the message published by the UE is not included in a second topic list of the message exchange server and the topic is included in the first topic list, transmitting a handover message to the UE,   wherein the message exchange server forwards the message published by the UE to other UEs subscribing to the topic regardless of whether or not the topic included in the message published by the UE is included in the second topic list of the message exchange server.   
     
     
         12 . The message exchange server of  claim 11 , wherein the message exchange server and the adjacent message exchange server share one or more topics for a boundary area between a first management area of the message exchange server and a second management area of the adjacent message exchange server. 
     
     
         13 . The message exchange server of  claim 12 , the operations further comprising:
 delaying transmission of the handover message to the UE until the UE is located within the boundary area or exits the boundary area.   
     
     
         14 . A user equipment (UE) related to vehicle-to-everything (V2X) message transmission and reception in a wireless communication system, the UE comprising:
 a communication interface configured to transmit and receive messages with one or more message exchange servers;   a display configured to display an image; and   a controller configured to:
 publish a message including a topic to a message exchange server, 
 receive a handover message from the message exchange server when the topic including in the message published by the UE is not included in a second topic list of the message exchange server and the topic is included in a first topic list of an adjacent message exchange server, and 
 display an Internet Protocol (IP) address of an adjacent message exchange server to handle a handover procedure for the UE based on the handover message, 
   wherein the message is forwarded by the message exchange server to other UEs subscribing to the topic regardless of whether or not the topic included in the message published by the UE is included in the second topic list of the message exchange server.   
     
     
         15 . The UE of  claim 14 , wherein the controller is further configured to calculate the topic based on a current location of the UE. 
     
     
         16 . The UE of  claim 14 , wherein the IP address is displayed after the UE has exited a first management area of the message exchange server and entered into a second management area of the adjacent message exchange server. 
     
     
         17 . The UE of  claim 14 , wherein the message is a Message Queuing Telemetry Transport (MQTT) Control Packet set as Reserved Control Packet Type=0.